/*
 *  ETA/OS - LibC helper functions
 *  Copyright (C) 2016  Michel Megens <dev@bietje.net>
 *
 *  This program is free software: you can redistribute it and/or modify
 *  it under the terms of the GNU Lesser General Public License as published by
 *  the Free Software Foundation, either version 3 of the License, or
 *  (at your option) any later version.
 *
 *  This program is distributed in the hope that it will be useful,
 *  but WITHOUT ANY WARRANTY; without even the implied warranty of
 *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 *  GNU Lesser General Public License for more details.
 *
 *  You should have received a copy of the GNU Lesser General Public License
 *  along with this program.  If not, see <http://www.gnu.org/licenses/>.
 */

#ifndef __STDLIB_HELPER_H__
#define __STDLIB_HELPER_H__

extern size_t strlen(const char *x);
static inline void __swap(char *x, char *y)
{
	char n;

	n = *x;
	*x = *y;
	*y = n;
}

static inline char *strrev(char *str)
{
	size_t start, end;
	char *rv;

	end = strlen(str) - 1;
	start = 0;
	rv = str;
	while(start < end) {
		__swap(str+start, str+end);
		start++;
		end--;
	}

	return rv;
}

#endif /* __STDLIB_HELPER_H__ */

